Comment 5 for bug 705510

groff changed the format of some of its warning messages in 1.21. The libx11 build process appears to have been trying to parse this, and the format change broke this. However, these messages are only human-readable, and libx11 really shouldn't have been trying to parse them in the first place.

(man-db, which I maintain, had a similar problem in its test suite. This was my fault, and I fixed it properly upstream.)

I tried to adjust the tbl markup to avoid the warnings in the first place (usually by changing the widest "description" column in a table to use an "x" column specifier, i.e. an expanded column, rather than a column specifier beginning with "w", i.e. an explicit minimal column width), but it seems tricky to do that in all cases. It's probably also ultimately a waste of effort since these documents were converted to DocBook XML upstream in libX11 1.4.1.

Therefore, I suggest the attached patch to simply ignore this specific warning for now. You'll need to rerun automake or otherwise update specs/*/Makefile.in.